also: こガモ
noun
duckling; baby duck
Refers to a young duck, typically a cute or small one. Common in everyday contexts.
公園の池で子鴨が泳いでいる。
Ducklings are swimming in the park pond.
子鴨は黄色くてふわふわしている。
Ducklings are yellow and fluffy.
More explicitly 'baby duck' using the word for domestic duck (アヒル). 子鴨 is a single compound word and can sound slightly more literary or compact.
Means 'duck' in general, without specifying age. 子鴨 specifically means a young duck.
Compound of 子 (こ, 'child') and 鴨 (かも, 'duck'). The reading こがも is a straightforward combination, with rendaku (voicing) not occurring here.